Grinding-mill and pulverizer.



No. 875,143. PATENTED DEC. 31, 1907. J. w. BOILBAU. GRINDING MILL AND PULVERIZBR.

APPLICATION FILED SEPT. 7, 1906.

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Suva Mex attoznmgo No. 875,143. I PATENTED DEC. 31, 1907. J. W. BOILEAU. GRINDING MILL AND PULVERIZER'.

APPLICATION FILED SEPT. 'I, 1906.

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wan/4? f) q arrow/"@130 c zen of the Uni d Sta ea-residing at Detroit, in the county of Wayne and State of -ceive the discharge end of a feed spout 8. 0n the rear side of the said tread or runway unnnn STATES PATENT oFrioE. 1

JAMES W. BQILEAU, OF DETROIT, MICHIGAN, ASSIGNOR 0F ONE-SIXTH TO JOSEPH T. BELA'N-' T0 EUGENE o. SPAULDING, 0F ciao, MICHIGAN.

.1311 AND ONE-SIXTH TO JOHN L. OOOHRANE, OF DETROIT, MICHIGAN,- AND ONE-SIXTH GRINDING-MILL Ann BULVERIZER.

I No. 875,143;

flpeoification of Letters Patent,

. Patented Dec. 31, 1907.

To all, whom it may concern:

Be it kn wn that I, AMEs W. BQILEAU, a

Michigan, have invented certain new and useful Improvements in GrindingMills and Pulverizers; and I do declare the following to be a full, clear, and exact description of the invention, such as will; enable others skilled in the art to which it appertains to make and use the same.

My invention is an improved grinding mill and pulverizer, especially adapted for grinding'or pulverizing mineralbearing rock, but also ada ted for grinding or pulverizing other materials and substances, and it consists in the construction, combination, and arrange-.v ment of .devices hereinafter described and claimed.

In the accompanying drawings,-.Figure 1 is a side elevation of the mill and pulverizer embodying my improvements; Fig. 2 is a longitudinal sectional view of a' portion of the same; Fig. 3 is a transverse sectional view taken on the plane indicated by the line a -a of Fig. 2.

I will first describe that portionof the machine which grinds or pulverizes the material. 0n a bed-plate 1 is mounted a casing 2, which is here shown as supported by brackets or feet 3, which are bolted thereto and also bolted on the bed-plate. Said casing is here shown as forming a pair of cylinders 4,, 5, disposed side by side and extending trans versely over the bed-plate. 1 In each of the said cylinders is a cylindrical tread or runway, that in the cylinder 4 being designated by the numeral 6 and that in the cylinder 5 being designated by the numeral 7.

The tread or runway 6 has an opening in one side which I will call the front side to re- 6, are discharge slots 9 for the passage of ground or comminuted material to the tread 0r runway 7 through similar slots 10 with which said: tread or runway 7 is provided. Said tread or runway 7 is further provided on its rear or discharge side with slots 1 1 of suitable fineness and length.

The casing 2 is here shown as made of two cylindrical or semi-cylindrical sections, bolted. together, as at 12. Itmay be otherwise I constructed within the scope of my invention asdefined by the appended claims, and I do not desire to limit myself in this particular. The tread or runway in each cylindrical ortion of the casing is provided with a palr of annular ball tracks 13, which are semi-cylim drical in cross-section, and are disposed side by side and suitably s aced apart, as at 14,

the feed spout 8 disc arging into the said space 14 between the pair ofball tracks in the tread or runway 6. The sides 15 of the casing form the heads of the cylindrical ortions thereof and the said sides are ere shown as secured in place by bolts 16.

91,11 the sides of the bed-plate are standards 17, provided with bearings 18, in which are mounted shafts 20, of a pair of revolvin rolls 21, which are dis osed in the cylindrica por- I tions of, the casing and revolve within the treads 01 runways of said'casing cylinders.

Each of the said rolls comprises a pair of eylindrioal portions 22, spaced a art and with their peripheries in line with t e ball tracks 13 of the treads or runways. Said cylindrical portions 22-of the rolls are provided with pockets 23, for the reception of balls 24. The said pockets are radially disposed.

'Their inner portions are semi-cylindrlCalin form and of a size to enable the balls 24'to snugly fit therein, and their outer portions are widened, as at 25. Passages 26 are made inwthe sides of the cylindrieal'portions 22 and extend to the ball pockets to enable material to ass into and from said ball pockets.

8n the sides of the cylindrical portions 22 of the rolls are wings 27. "The said Wings are providedon their inner sides near their rear ends with dovetailed ribs 28, which fit in similarly-shaped grooves 29 that are made radially in the sides of the cylindrical portions 22 and are bolted therein. portions of the said wings 27 bear on the sides of the cylindrical portions 22 ofthe rolls and are bolted'thereto, asat 30.- The direction of rotation of the rolls is indicated by the arrows in Fig. 2. The'wings 27 are arranged opposite each other in pairs and diverge forwardly. Their outer edges are con centric with the treadways, and they are partly cut away and rounded at their front ends, as at 31. tation of the rolls, serve to cause the material to be forced into the paths of the balls which The. front I These wings, during the roare carried around within the'gb all tracks by the rotation of the rolls and also serve to cause the finely divided particles of the material as the same becomes comminuted by the action of the balls and the ball tracks to be discharged from the said casing cylindersthrough the enings 9 or 11, as the case may be. The ba ls are thrown centrifugally against the ball tracks by the rotation of the material discharged from the initially acting roll will be reground and more finely reduced rolls,.are carried by the rolls and are caused to revolve in the said ball tracks, and to act on the material therein so as to grind the same It will beunderstood that the ground by the next roll. I

As will be obvious any desired number of the rolls may be employed. Two are here shown for the purposes of this specification, but I do not desire to limit myself in this particular.

In addition to the centrifugal action. of the rolls and the-balls in discharging the ground orreduced material, the arrangement and s outs 36. A'discharge screw 37 is here srown as operating in. the bottomof sald 'du'st chamber to convey dust that drops to the bottom thereof'to the several discharge s outs. The shaft of said discharge screw is siiown' as connected by apair of miter gears 38*to a-shaft39, which may be driven by any suitable-means" A fan or blower 40 is lodated at the, tear end of the dust chamber 33 to cause the finer material to be drawn therethrough' and be discharged into a chamber 4'1, whichis-provided with a dust stack 42. Having thus described my nvention, what Their shafts -20 are herev I claim as new, and desire to secure byfLetters-Patent, is, i 1.-A mill of the class described having a casing provided with an annular runway on its inner side, said runway having an annular ball track substantially semi-cylindrical in cross section and plain annular surfaces on opposfitesides of said ball track, a roller, located and revoluble in said casing, said roller having a main portion cylindrical in form and of a width exceeding that of the ball track and projecting portions cylindrical in form, of less diameter than and projecting from opposite sides, of said main portion and concentric therewith, said main'portion having semi-spherical, peripheral pockets, pas sages extending from said pockets to its sides and vfurther provided with wings on its sides intermediate said pockets, projectingradially from. said main portion, diverging nthe direction, of the rotation of the roller, disposed ,opposite the plain annularsurfacesof the runway, and. overhanging the projecting ortions of the roller, and centrifugallyeact mg grinding balls partlyin said pockets and partlyin said ball track and retained in said pockets by said ball track,substantiallyas described. h t

v2. A null of the class described, having a plurality of casings, each communicating with the one adjacent thereto, the first of saidcasings having a feed 0 ening and the last. having a screened disc iarge opening, eachrof, said casings having a lining formed with .anannular runway, on ts inner side having a ball track, saidlining having; grated 0 enings in their opposing sldes to permit t e passage of reduced materialfrom one lin ing to another, a roller located and revoluble in each casing and having peri )heral pockets and concentrically-acting revo uble grinding ballspartly in said pockets and partly in the ball track, substantially as described.

In testimony whereof I havehereunto set my hand in presence of two subscribing witnesses. K

v JAMES W. BOILEAU- Witnesses: i I i JOSEPH T. BELAXGER, I I HARVEY F. BE,LANGER. 

